Bangerter's inventions; his marvelous time clock
A 1911 promotional and technical account of Friedrich Bangerter's clock and perpetual-motion machines, edited by Everett Lincoln King and printed in New York for investors and mechanically curious readers. Line plates give patent-style plan, section and elevation views of gear trains, weight-driven cases and drive wheels with leader-numbered parts, alongside halftone photographs of assembled brass mechanisms on stands.
